【摘要】 研究利用Wigner-Hough变换对水下目标信号的检测问题。当信号的时频分布具有线条成分时,可以显著提高检测信噪比,同时对多分量信号时频分布的交叉项具有明显的抑制作用。仿真结果表明:对于多分量线性调频信号,当信噪比为-5 dB时;对于单分量信号,当信噪比为-7dB时,Wigner-Hough变换仍然具有很好的检测性能。将它应用于实际的湖试水声信号,仍然具有较好的检测结果。更多还原

【Abstract】 The application of Wigner-Hough transform(WHT) in detection of underwater transient signals was demonstrated.It could be found that the output signal to noise ratio(SNR) was enhanced greatly when the time frequency distribution of undertwater acoustic transient signals contained line components.Simultaneously,WHT could reduce the cross terms of multi-component signals.Simulation results show that WHT can detect and identify the signals better even if the SNR is-5?dB for multi-component signals and-7?dB for mono-component signals.When this method is used to analyze real lake test data in which some transient components are included,the analysis results show that WHT detection is superior to matched filter,Wigner-Ville distribution(WVD) and cross Wigner-Ville distribution(XWVD).更多还原